CN1496620A - Multi-carrier transmission/reception apparatus - Google Patents
Multi-carrier transmission/reception apparatus Download PDFInfo
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- CN1496620A CN1496620A CNA02806125XA CN02806125A CN1496620A CN 1496620 A CN1496620 A CN 1496620A CN A02806125X A CNA02806125X A CN A02806125XA CN 02806125 A CN02806125 A CN 02806125A CN 1496620 A CN1496620 A CN 1496620A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/70735—Code identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7083—Cell search, e.g. using a three-step approach
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
- H04L5/0021—Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
Abstract
A multicarrier radio communication technology that enables radio resources to be used effectively, interference-to be suppressed, and a cell search to be performed at high speed, in a multicarrier CDMA system. In this technology, a secondary synchronization code (S-SCH signal) for identifying the group of scrambling codes divided into groups beforehand is frequency multiplexed in a plurality of subcarriers. A secondary synchronization code is coded in the time direction. Subcarriers in which a secondary synchronization code is multiplexed are mutually separated and equally spaced. The number of subcarriers in which a secondary synchronization code is multiplexed can be set to a small value with respect to the total number of subcarriers. A secondary synchronization code is an orthogonal code. On the receiving side, a cell search is carried out using such a frequency multiplexed type S-SCH.
Description
Technical field
The present invention relates to multicarrier transmission/receiving system, multi-carrier wireless communication method and multi-carrier wireless communication program.
Background technology
In recent years, in radio communication, particularly mobile communication, except that sound, all information such as image and data also is transmitted.From now on, anticipation for the transmission of various content need continue increase, and then improved the necessity that transmits for highly reliable, high-speed, big capacity.Yet,, can not ignore the influence of the delay ripple that causes by multipath transmisstion, and cause the transmission characteristic deterioration by frequency selective fading (fading) when in mobile communication, carrying out high speed when transmitting.
A kind of as the frequency selective fading countermeasure technology, OFDM multi-carrier modulation methods such as (OFDMs) is noticeable.Multi-carrier modulation method is this technology, promptly uses several carrier waves (subcarrier) that transfer rate is suppressed at the level that frequency selective fading do not take place to transmit data, transmits thereby reach at a high speed.Use the OFDM method, several subcarriers of configuration data are mutually orthogonal on it, make multi-carrier modulation method that highest spectral efficiency is provided.In addition, the OFDM method can realize with fairly simple hardware configuration.These all are the noticeable reasons of OFDM.
CDMA spectrum spreading methods such as (code division multiple accesss) is another example of frequency selective fading countermeasure technology.By with the specific spreading code of each user on frequency axis directly each user's of expansion information, to obtain spreading gain, CDMA has improved anti-interference, and has been used for mobile communication.
Recently, as the access method that realizes faster transmission, the method (be known as MC (multicarrier)-CDMA or OFDM-CDMA, but after this be called " CDMA multiple carrier ") of combination OFDM and CDMA is noticeable especially.CDMA multiple carrier roughly is divided into: the time domain extended pattern, and wherein in each subcarrier, expand segment (chip) and be placed on the time shaft; And the frequency domain expansion type, wherein expand segment and be placed on the frequency axis in each time.In the former occasion, obtained the path diversity effect but can not get the frequency diversity effect, and in the latter's occasion, on the contrary, obtained the frequency diversity effect but can not get the path diversity effect.
Example with the Cell searching method of this CDMA multiple carrier is recorded in " 3-Step Cell SearchPerformance using frequency-multiplexed SCH for Broadband Multi-carrierCDMA Wireless Access " (Hanada, Atarashi, Higuchi, Sawahashi), TECHNICALREPORT OF IEICE.NS2001-90, RCS2001-91 (2001-07), pp.73-78.
Herein; for the broadband wireless access method of using CDMA multiple carrier at down link, at first detect FFT (leaf transformation Fu fast) window regularly (phase I: the FFT window regularly detects) by the peak of the correlation that partly generates from protection compartment and effective code element.Thereafter, regularly carrying out FFT with this FFT window handles, the relevant 1 frame length integration of the subcarrier components of multiplexing synchronizing channel (SCH) and SCH duplicate to each subcarrier, this detection value is average by increasing at the power of frequency direction and time orientation, and the timing that detects the maximal correlation output after average is then as frame regularly detected (second stage: frame regularly detects).Then, for using each subcarrier of regularly locating time-multiplexed common pilot channel (CPICH) at the frame that is detected, at relevant the carry out integration of time orientation to each scrambled code, and detect the correlation of each subcarrier, carry out homophase in frequency direction and increase (in-phase addition), carry out power at time orientation and increase (power addition), and detect the correlation of each scrambled code.Detect the scrambled code of the correlation maximum of scrambled code, and identification scrambled code (the 3rd stage: scrambled code identification).
Yet, the problem of above-mentioned traditional Cell searching method is, because after obtaining frame synchronization, the time-multiplexed common pilot channel and the correlation of scrambled code are that each scrambled code is tried to achieve, timing when this correlation is maximum detects scrambled code, and the identification scrambled code, therefore, when scrambled code quantity for a long time, Cell searching (obtaining of initial synchronisation) spended time.Further problem is, even after initial synchronisation, when carrying out another Cell searching, also must carry out the processing same with the initial synchronisation Cell searching, this same spended time.
Summary of the invention
The purpose of this invention is to provide multicarrier transmission/receiving system, multi-carrier wireless communication method and the multi-carrier wireless communication program that in multi-carrier CDMA system, effectively to utilize Radio Resource, suppress to disturb and carry out at high speed Cell searching.
In order to solve the problem in traditional Cell searching method when CDMA multiple carrier is used as the downlink wireless access method (time of scrambled code quantity Cell searching cost for a long time), by being conceived to 3GPP (3
RdGeneration Partnership Project) " cell search procedure " that discloses in the standard " TS25.214 physical layer procedures (FDD) ", the inventor has made the present invention, and has considered how to be applied to multi-carrier CDMA system.
Of the present inventionly to be intended to, be used for the scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned is configured on the frequency, that is, and at the multiplexing scrambled code group identification code of multi-carrier signal medium frequency.
According to one embodiment of the invention, a kind of multicarrier transmitter apparatus carries out radio communication by combination multi-carrier modulation and CDMA, and has an arrangement components, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, and transmit block, it sends multi-carrier signal, has disposed described scrambled code group identification code by described arrangement components on frequency in this signal.
According to another embodiment of the present invention, a kind of multicarrier receiver carries out radio communication by combination multi-carrier modulation and CDMA, and has a receiving-member, it receives multi-carrier signal, on frequency, disposed in this signal and be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, extracting said elements, it extracts described scrambled code group identification code from the multi-carrier signal that described receiving-member receives, first identification component, its described scrambled code group identification code that uses described extracting said elements to extract is discerned the scrambling code character, with second identification component, it is based on the scrambling code character of described first identification component identification, identification is by the scrambled code of the multi-carrier signal use of described reception.
According to still another embodiment of the invention, a kind of multi-carrier wireless communication method is the multi-carrier wireless communication method in the multicarrier transmitter apparatus that carries out radio communication by combination multi-carrier modulation and CDMA, and this multi-carrier wireless communication method has configuration step, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, and forwarding step, it sends multi-carrier signal, has disposed described scrambled code group identification code in this signal in described configuration step on frequency.
According to still another embodiment of the invention, a kind of multi-carrier wireless communication method is the multi-carrier wireless communication method in the multicarrier receiver that carries out radio communication by combination multi-carrier modulation and CDMA, and this multi-carrier wireless communication method has receiving step, it receives multi-carrier signal, on frequency, disposed in this signal and be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, extraction step, it extracts described scrambled code group identification code from the multi-carrier signal that receives described receiving step, first identification step, it uses the described scrambled code group identification code that extracts in described extraction step to discern the scrambling code character, with second identification step, it is based on the scrambling code character of discerning in described first identification step, discern the scrambled code of the multi-carrier signal use of described reception.
According to still another embodiment of the invention, a kind of multi-carrier wireless communication program is the multi-carrier wireless communication program in the multicarrier transmitter apparatus that carries out radio communication by combination multi-carrier modulation and CDMA, and this multi-carrier wireless communication program makes computer carry out configuration step, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, and forwarding step, it sends multi-carrier signal, has disposed described scrambled code group identification code in this signal in described configuration step on frequency.
According to still another embodiment of the invention, a kind of multi-carrier wireless communication program is the multi-carrier wireless communication program in the multicarrier receiver that carries out radio communication by combination multi-carrier modulation and CDMA, and this multi-carrier wireless communication program makes computer carry out receiving step, it receives multi-carrier signal, on frequency, disposed in this signal and be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned, extraction step, it extracts described scrambled code group identification code from the multi-carrier signal that receives described receiving step, first identification step, it uses the described scrambled code group identification code that extracts in described extraction step to discern the scrambling code character, with second identification step, it is based on the scrambling code character of discerning in described first identification step, discern the scrambled code of the multi-carrier signal use of described reception.
Description of drawings
Fig. 1 is the block diagram of expression according to the configuration of the multicarrier transmitter apparatus of one embodiment of the invention;
Fig. 2 represents from an example of the frame configuration of the signal that sends according to the multicarrier transmitter apparatus of this embodiment;
Fig. 3 represents three dimensional frame shown in Figure 2 is configured in the figure that watches on the two dimensional surface that contains time shaft and frequency axis;
Fig. 4 represents from another example of the frame configuration of the signal that sends according to the multicarrier transmitter apparatus of this embodiment;
Fig. 5 is the block diagram of expression according to the configuration of the multicarrier receiver of one embodiment of the invention;
Fig. 6 is the flow chart of expression according to the algorithm of the Cell searching of one embodiment of the invention;
Fig. 7 provides the explanation to Cell searching algorithm shown in Figure 6;
Fig. 8 represents from another example of the frame configuration of the signal that sends according to the multicarrier transmitter apparatus of this embodiment;
Fig. 9 represents three dimensional frame shown in Figure 8 is configured in the figure that watches on the two dimensional surface that contains time shaft and frequency axis.
Embodiment
Followingly embodiments of the invention are made a detailed description with reference to accompanying drawing.In the embodiment of following explanation, suppose to utilize auxiliary synchronous code (SSC) in " cell search procedure " that discloses in the 3GPP standard " TS25.214 physical layer procedures (FDD) " for example or auxiliary synchronization channel (S-SCH) as the scrambled code group identification code.
Fig. 1 is the block diagram of expression according to the configuration of the multicarrier transmitter apparatus of one embodiment of the invention.
Multicarrier transmitter apparatus shown in Figure 1 (hereinafter to be referred as " dispensing device ") 100 uses CDMA multiple carrier, and has addressable part 102, modulating part 104, spread spectrum parts 106, frame assembling parts 108, scrambling parts 110, primary synchronization channel (P-SCH) interpolation parts 112, auxiliary synchronization channel (S-SCH) interpolation parts 114, inverse fast fourier transform (IFFT) parts 116, protection insertion parts 118, wireless transmission parts 120 and antenna 122 at interval.This dispensing device 100 can be installed in the base station apparatus in the mobile communication system for example.
Provide simple declaration herein for the CDMA multiple carrier method.
Use CDMA multiple carrier, signal distributes transmission among several (X) carrier waves (subcarrier).Particularly, send signal at first by spreading code at frequency axis direction spread spectrum, and by code division multiplexing.The signal of code division multiplexing is subjected to serial/parallel conversion and becomes parallel signal with sub-carrier number equivalent.
In CDMA multiple carrier, each subcarrier is modulated so that become orthogonal signalling by OFDM.From serial/parallel conversion and parallel signal handle and send through IFFT.Handle by IFFT, ofdm signal can keep the state of signal in orthogonal between each subcarrier.Herein, signal in orthogonal means that a certain subcarrier signals frequency spectrum is to the not influence of other subcarrier signals.When carrying out the OFDM modulation, will protect and insert the OFDM code element at interval.When only having the delay ripple that is shorter than the protection gap length, protection is inserted at interval the orthogonality between each subcarrier is kept.
Next, the operation of the dispensing device 100 that has above-mentioned configuration is described.
Dispensing device 100 is at first encoded to sending data in addressable part 102, then in modulating part 104 the transmission data behind the coding are modulated, and the transmission data after using unique spreading code to modulation in spread spectrum parts 106 is carried out spread spectrum.This spread spectrum sends data and is divided into the segment unit, and exports frame assembling parts 108 to.
In frame assembling parts 108, with the precalculated position (frame assembling) of the transmission data configuration behind the spread spectrum on frequency axis and time shaft.The frame that assembles is output to scrambling parts 110.
In scrambling parts 110, be used for discerning sub-district (or sector) scrambled code, the whole frame that assembles is implemented scrambling.Scrambled frame is output to P-SCH interpolation parts 112.
In P-SCH added parts 112,---to be primary synchronization channel (P-SCH) signal---be added into scrambled frame to the Primary Synchronisation Code (PSC) that is used for obtaining frame synchronization.For example, Primary Synchronisation Code can be disposed at (being channeling) on several frequencies (with reference to Fig. 2 described later and Fig. 3) continuously at time orientation.The frame that has added Primary Synchronisation Code is output to S-SCH interpolation parts 114.
In S-SCH adds parts 114, be used for discerning the scrambling code character auxiliary synchronous code (SSC), be that auxiliary synchronization channel (S-SCH) signal is added into the frame that has added Primary Synchronisation Code.For example, auxiliary synchronous code can time orientation coding and configurable on several frequencies (being channeling) (with reference to Fig. 2 described later and Fig. 3).In this stage, finished the frame configuration of signal to be sent.Herein, the scrambling code character is the one group of scrambled code that is divided into group in advance, and unique code is distributed each group.That is, scrambled code is divided into several groups, and a group code each group of attaching troops to a unit.The frame that has added auxiliary synchronous code is output to IFFT parts 116.
In IFFT parts 116, the frame (transmission signal) that has added auxiliary synchronous code becomes time domain through inverse fast fourier transform (IFFT) processing and from frequency domain transform, then exports protection insertion parts 118 at interval to.
In the insertion parts 118 of protection interval,, will protect the output signal of inserting at interval from IFFT parts 116 in order to improve for the characteristic that postpones.Protection realizes at interval it being by the end of effective code element part being copied to the beginning of this code element based on code element one by one.
After protection is inserted at interval, signal in wireless transmission parts 120 through as the wireless processing of up-conversion, and as radio signal from antenna 122 transmissions.
Remove wireless transmission parts 120, the processing of each parts 102～118 can use the microprocessor (computer) that is called DSP (digital signal processor), as carrying out based on the base band signal process of predetermined software (preset program).
Fig. 2 represents from an example of the frame configuration of the signal of dispensing device 100 transmissions, and Fig. 3 is configured in the figure that watches on the two dimensional surface that contains time shaft and frequency axis with three dimensional frame shown in Figure 2.
Herein, as shown in Figures 2 and 3, Primary Synchronisation Code (P-SCH signal) and auxiliary synchronous code (S-SCH signal) carry out channeling respectively in several subcarriers.More specifically, for auxiliary synchronous code (S-SCH signal), at the coded sequence C of time orientation coding
1C
2C
3C
4C
5C
6In several subcarriers, carry out the channeling (see figure 3).
At this moment, the subcarrier of multiplexing Primary Synchronisation Code and the subcarrier of multiplexing auxiliary synchronous code are separated from each other, preferably with uniformly-spaced, so that obtain the effect of frequency diversity---and promptly so that lower the influence of frequency selective fading.
And the sub-carrier number of multiplexing Primary Synchronisation Code can be configured to the little value of relative total number of sub-carriers (X) with the sub-carrier number of multiplexing auxiliary synchronous code.Thus, the influence to other multiplexed signals can be remained on minimum.
Moreover as shown in Figure 2, common pilot channel (CPICH) is only located just by time-multiplexed deterioration to avoid radio channel resource to distribute in some time.
At this moment, scrambled code is applied to frequency direction.In Fig. 2, " DSCH/DPCH " expression " downlink sharied signal channel/DPCH ".
Auxiliary synchronous code preferably should be an orthogonal code.For example, the Walsh-Hadamard sign indicating number can use as orthogonal code.Auxiliary synchronous code can be minimized relevant possibility with other auxiliary synchronous code as orthogonal code, the accuracy of identification of scrambling code character is improved.
In addition, can make the length of the unit sequence that is shorter in length than time orientation of auxiliary synchronous code, and the configuration auxiliary synchronous code so that with predetermined other signal (for example, another multiplexed signals as common pilot channel (CPICH)) multiplexing ratio minimum, in other words, the part that is re-used of other signal of avoiding as far as possible being scheduled to.For example, as shown in Figure 4,, avoid disposing auxiliary synchronous code as much as possible having in the multiplexing part A with shared pilot channel (CPICH).Thus, the interference of other signal that may suppress to be scheduled to.
Fig. 5 is the block diagram of expression according to the configuration of the multicarrier receiver of one embodiment of the invention.
Multicarrier receiver shown in Figure 5 (hereinafter to be referred as " receiver ") 200 carries out radio communication with the dispensing device 100 that uses CDMA multiple carrier, and has antenna 202, part of wireless receive 204, FFT is detection part 206 regularly, FFT processing unit 208, P-SCH extracting said elements 210, frame is detection part 212 regularly, S-SCH extracting said elements 214, correlation detection part 216, group code memory unit 218, scrambling code character detection part 220, scrambled code identification component 222, scrambling code character memory unit 224, remove to disturb parts 226, estimation unit 228, contrary spread spectrum parts 230, demodulation parts 232 and decoding parts 234.This receiver 200 can be installed in the mobile station apparatus in the mobile communication system for example.
Next, the operation of the receiver 200 that has above-mentioned configuration is described.
In part of wireless receive 204, the signal execution that is received by antenna 202 is handled as the predetermined radio of down-conversion.Output signal (baseband signal) from part of wireless receive 204 is output to FFT timing detection part 206.
From FFT regularly detection part 206 to each parts of scrambling code character memory unit 224, use Fig. 2 and channeling type S-SCH shown in Figure 3 to carry out Cell searching.Particularly, as the phase I, set up symbol synchronization by FFT timing detection part 206; As second stage, set up frame synchronization by FFT processing unit 208, P-SCH extracting said elements 210 and frame timing detection part 212; As the phase III, carry out the identification (part 1) of scrambled code by S-SCH extracting said elements 214, correlation detection part 216, group code memory unit 218 and scrambling code character detection part 220---be the identification of scrambling code character; And, carry out the identification (part 2) of scrambled code by scrambled code identification component 222 and scrambling code character memory unit 224 as the 4th stage.Herein in general, the multiplexing S-SCH signal of frequency of utilization carries out the identification of scrambling code character, detects correlation with scrambled code contained in this group, and the identification scrambled code.
Below use Fig. 6 and Fig. 7 to specifically describe the processing in each stage.Fig. 6 is the flow chart of expression according to the algorithm of the Cell searching of present embodiment, and Fig. 7 provides the explanation to Cell searching algorithm shown in Figure 6.
(1) phase I: symbol synchronization
At first, in step S1000, FFT regularly detection part 206 detects the protection compartment of received signals and the correlation of end part on the effective code element partial-length of effective code element part, and will detect timing that maximum related value exports as the timing of FFT window.
(2) second stage: frame synchronization
In step S2000, the FFT window that FFT processing unit 208 detected in the phase I is regularly located to carry out FFT and is handled.
In step S3000, P-SCH extracting said elements 210 uses the FFT result among the step S2000, the subcarrier components of extraction channeling P-SCH.
In step S4000, carry out increasing for each subcarrier components that extracts among the step S3000, frame timing detection part 212 with the relevant homophase on 1 frame length of frame synchronizing signal duplicate, carrying out power on frequency direction increases, and detects correlation.The timing that detects maximum related value output is used as the FFT window regularly.
(3) phase III: the identification of scrambled code (part 1)
In step S5000, the FFT window that S-SCH extracting said elements 214 detected in the phase I is regularly located to carry out FFT and is handled, and extracts the subcarrier components (see figure 7) of channeling S-SCH from the frame beginning position of detecting in second stage regularly.
In step S6000, correlation detection part 216 and scrambling code character detection part 220 carry out the identification of scrambling code character.That is, mobile station apparatus (receiver 200) is held whole scrambled codes and scrambled code group code in advance as information.Particularly, in group code memory unit 218, store whole scrambled code group codes, and in scrambling code character memory unit 224, store whole scrambled codes corresponding to the scrambling code character.Correlation detection part 216 is created duplicate from the scrambled code group code that is stored in group code memory unit 218, obtain being correlated with for each subcarrier components that in step S5000, extracts, carrying out homophase on 1 frame length increases, carrying out power on frequency direction increases, and detects the correlation (see figure 7) of each group code.Scrambling code character detection part 220 then detects maximal correlation output, detects group code, also detects (identification) scrambling code character.
(4) quadravalence sections: the identification of scrambled code (part 2)
In step S7000, scrambled code identification component 222 is relevant for multiplexing common pilot channel (CPICH) detection of each scrambled code, service time contained in the scrambling code character that detects in the phase III, and identification detects the scrambled code of maximal correlation output to it.
When having finished the identification of scrambled code, remove to disturb parts 226 and use the scrambled code of having discerned that sub-district (or sector) discerned by above processing.Having removed to disturb signal is output to estimation unit 228.
Remove communication terminal 204, the processing of parts 206 to 234 can use the microprocessor (computer) that is called DSP, as carrying out based on the base band signal process of predetermined software (preset program).
Thereby, according to present embodiment, in multi-carrier CDMA system, auxiliary synchronous code (S-SCH) carries out the channeling (see figure 2) in several subcarriers, and frequency of utilization composite S-SCH carries out Cell searching, thereby, by utilizing auxiliary synchronous code may shorten the recognition time of scrambled code, and when effectively utilizing Radio Resource and suppress disturbing, carry out Cell searching at high speed, meanwhile, by being done to set to exempt from, the suitable number of the subcarrier of the channeling of auxiliary synchronous code influences other multiplexed signals.
The auxiliary synchronous code multiplexing method is not limited to Fig. 2 and example shown in Figure 3.For example, as Fig. 8 and shown in Figure 9, also may use this configuration, promptly auxiliary synchronous code (S-SCH) is included in the coded sequence C that encodes on the frequency direction
1C
2C
3, this auxiliary synchronous code carries out channeling in several subcarriers.This moment is same, and the subcarrier of multiplexing auxiliary synchronous code is separated from each other, and uniformly-spaced.Moreover in order to prevent the deterioration that radio channel resource distributes, common pilot frequency channel (CPICH) is Cai only time-multiplexed in some time.
As described above, according to the present invention, in multi-carrier CDMA system, might effectively utilize Radio Resource, suppress to disturb, also carry out at high speed Cell searching.
That is, at transmitter side, the scrambled code group identification code of group of scrambled code that is used for discerning prior grouping is (for example, with reference to 3GPP (3
RdGeneration Partnership Project) " cell search procedure " that discloses in the standard " TS25.214 physical layer procedures (FDD) ") disposing on the frequency---promptly in multi-carrier signal, the scrambled code group identification code is carried out channeling; And at receiver side, use contained scrambled code group identification code in the multi-carrier signal that is received is discerned the scrambling code character, and in the scrambling code character of identification, discern scrambled code, make by utilizing the scrambled code group identification code, may shortening the recognition time of scrambled code, and when effectively utilizing Radio Resource and suppress disturbing, carry out Cell searching at high speed, meanwhile, by being done, the suitable number of the subcarrier of the channeling of scrambled code group identification code sets the influence that suppresses other multiplexed signals.
Especially,, then can adopt the time domain extended method on time orientation, and owing to carry out channeling, thereby path diversity effect and frequency diversity effect can both obtain for the scrambled code group identification code if the scrambled code group identification code encodes.
Also have,, then can improve the probability of the identification of scrambling code character on several frequencies if the scrambled code group identification code disposes.
And then, if the scrambled code group identification code is encoded, then can adopt frequency domain expansion, and time-multiplexed by carrying out, path diversity effect and frequency diversity effect can both obtain for the scrambled code group identification code on frequency direction.
Moreover, if the scrambled code group identification code disposes, then may lower the influence of frequency selective fading between scrambling code character recognition phase on several frequencies that are separated from each other.
In addition, if the scrambled code group identification code is orthogonal code, then can minimize with other auxiliary synchronous code relevant may, the accuracy of identification of scrambling code character is improved.
Also have, if what make auxiliary synchronous code is shorter in length than the length of coding staff to unit sequence, and on frequency configuration scrambled code group identification code, with with predetermined other signal (for example, another multiplexed signals as common pilot channel (CPICH)) multiplexing ratio becomes minimum, then the interference of other signal that may suppress to be scheduled to.
The Japanese patent application No.2001-375083 that the application submitted to based on December 7 calendar year 2001 comprises its full content in this referential expression.
The industry utilizability
The present invention is applicable to mobile station apparatus in GSM or base station apparatus etc.
Claims (15)
1. multicarrier transmitter apparatus, it carries out radio communication by combination multi-carrier modulation method and CDMA method, and described multicarrier transmitter apparatus comprises:
Arrangement components, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned; With
Transmit block, it sends multi-carrier signal, has disposed described scrambled code group identification code by described arrangement components on frequency in this signal.
2. multicarrier transmitter apparatus according to claim 1, wherein said scrambled code group identification code is encoded on time orientation.
3. multicarrier transmitter apparatus according to claim 2, wherein said scrambled code group identification code disposes on several frequencies.
4. multicarrier transmitter apparatus according to claim 1, wherein said scrambled code group identification code disposes on several frequencies and encodes on frequency direction.
5. multicarrier transmitter apparatus according to claim 3, wherein said arrangement components dispose described scrambled code group identification code on several frequencies that are separated from each other.
6. multicarrier transmitter apparatus according to claim 4, wherein said arrangement components dispose described scrambled code group identification code on several frequencies that are separated from each other.
7. multicarrier transmitter apparatus according to claim 1, wherein said scrambled code group identification code is an orthogonal code.
8. multicarrier transmitter apparatus according to claim 1, what wherein said arrangement components made described scrambled code group identification code is shorter in length than the length of coding staff to unit sequence, and on frequency the described scrambled code group identification code of configuration, become minimum with ratio with predetermined other signal multiplexing.
9. multicarrier receiver, it carries out radio communication by combination multi-carrier modulation method and CDMA method, and described multicarrier receiver comprises:
Receiving-member, it receives multi-carrier signal, has disposed in this signal to be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned on frequency;
Extracting said elements, it extracts described scrambled code group identification code from the multi-carrier signal that described receiving-member receives;
First identification component, its described scrambled code group identification code that uses described extracting said elements to extract is discerned the scrambling code character; With
Second identification component, the scrambled code that its scrambling code character based on the identification of described first identification component, identification are used by the multi-carrier signal of described reception.
10. base station apparatus, it has multicarrier transmitter apparatus according to claim 1.
11. a mobile station apparatus, it has multicarrier receiver according to claim 9.
12. a multi-carrier wireless communication method, it is being undertaken in the multicarrier transmitter apparatus of radio communication by combination multi-carrier modulation method and CDMA method, and described multi-carrier wireless communication method comprises:
Configuration step, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned; With
Forwarding step, it sends multi-carrier signal, has disposed described scrambled code group identification code in this signal in described configuration step on frequency.
13. a multi-carrier wireless communication method, it is being undertaken in the multicarrier receiver of radio communication by combination multi-carrier modulation method and CDMA method, and described multi-carrier wireless communication method comprises:
Receiving step, it receives multi-carrier signal, has disposed in this signal to be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned on frequency;
Extraction step, it extracts described scrambled code group identification code from the multi-carrier signal that receives described receiving step;
First identification step, it uses the described scrambled code group identification code that extracts in described extraction step to discern the scrambling code character; With
Second identification step, the scrambled code that it uses based on the multi-carrier signal of the scrambling code character of discerning in described first identification step, the described reception of identification.
14. a multi-carrier wireless communication program, it is being undertaken in the multicarrier transmitter apparatus of radio communication by combination multi-carrier modulation method and CDMA method, and described multi-carrier wireless communication program is carried out computer:
Configuration step, it disposes on frequency and is used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned; With
Forwarding step, it sends multi-carrier signal, has disposed described scrambled code group identification code in this signal in described configuration step on frequency.
15. a multi-carrier wireless communication program, it is being undertaken in the multicarrier receiver of radio communication by combination multi-carrier modulation method and CDMA. method, and described multi-carrier wireless communication program is carried out computer:
Receiving step, it receives multi-carrier signal, has disposed in this signal to be used for scrambled code group identification code that the scrambling code character that is divided into group is in advance discerned on frequency;
Extraction step, it extracts described scrambled code group identification code from the multi-carrier signal that receives described receiving step;
First identification step, it uses the described scrambled code group identification code that extracts in described extraction step to discern the scrambling code character; With
Second identification step, the scrambled code that it uses based on the multi-carrier signal of the scrambling code character of discerning in described first identification step, the described reception of identification.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP375083/2001 | 2001-12-07 | ||
| JP2001375083A JP3694479B2 (en) | 2001-12-07 | 2001-12-07 | Multi-carrier transceiver apparatus, multi-carrier wireless communication method, and multi-carrier wireless communication program |
Publications (2)
| Publication Number | Publication Date |
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| CN1496620A true CN1496620A (en) | 2004-05-12 |
| CN100539480C CN100539480C (en) | 2009-09-09 |
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| Country | Link |
|---|---|
| US (1) | US7386055B2 (en) |
| EP (1) | EP1453232A4 (en) |
| JP (1) | JP3694479B2 (en) |
| CN (1) | CN100539480C (en) |
| AU (1) | AU2002354171A1 (en) |
| WO (1) | WO2003049344A1 (en) |
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2001
- 2001-12-07 JP JP2001375083A patent/JP3694479B2/en not_active Expired - Fee Related
-
2002
- 2002-12-03 CN CNB02806125XA patent/CN100539480C/en not_active Expired - Fee Related
- 2002-12-03 AU AU2002354171A patent/AU2002354171A1/en not_active Abandoned
- 2002-12-03 WO PCT/JP2002/012618 patent/WO2003049344A1/en active Application Filing
- 2002-12-03 US US10/468,791 patent/US7386055B2/en not_active Expired - Fee Related
- 2002-12-03 EP EP02786007A patent/EP1453232A4/en not_active Withdrawn
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| CN102281250B (en) * | 2006-02-08 | 2015-01-28 | 摩托罗拉移动公司 | Method and apparatus for a synchronization channel in an OFDMA system |
| WO2008049283A1 (en) * | 2006-10-20 | 2008-05-02 | Timi Technologies Co., Ltd. | A method and system for data transmission and reception using scrambling codes to identify cells |
| CN103354533A (en) * | 2007-10-04 | 2013-10-16 | 高通股份有限公司 | Scrambling sequence generation in a communication system |
| US9622246B2 (en) | 2007-10-04 | 2017-04-11 | Qualcomm Incorporated | Scrambling sequence generation in a communication system |
| CN103354533B (en) * | 2007-10-04 | 2017-04-12 | 高通股份有限公司 | Method and device for scrambling sequence generation in communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003179522A (en) | 2003-06-27 |
| US20040085946A1 (en) | 2004-05-06 |
| WO2003049344A1 (en) | 2003-06-12 |
| EP1453232A4 (en) | 2011-05-25 |
| EP1453232A1 (en) | 2004-09-01 |
| AU2002354171A1 (en) | 2003-06-17 |
| JP3694479B2 (en) | 2005-09-14 |
| CN100539480C (en) | 2009-09-09 |
| US7386055B2 (en) | 2008-06-10 |
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